[Code of Federal Regulations]
[Title 14, Volume 2]
[Revised as of January 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 14CFR125.117]

[Page 579]
 
                     TITLE 14--AERONAUTICSAND SPACE
 
CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION 
                               (CONTINUED)
 
PART 125--CERTIFICATION AND OPERATIONS: AIRPLANES HAVING A SEATING 
CAPACITY OF 20 OR MORE PASSENGERS OR A MAXIMUM PAYLOAD CAPACITY OF 6,000
 POUNDS OR MORE; AND 
RULES GOVERNING PERSONS ON BOARD SUCH AIRCRAFT--Table of Contents
 
              Subpart E--Special Airworthiness Requirements
 
Sec. 125.117  Ventilation.

    Each passenger or crew compartment must be suitably ventilated. 
Carbon monoxide concentration may not be more than one part in 20,000 
parts of air, and fuel fumes may not be present. In any case where 
partitions between compartments have louvres or other means allowing air 
to flow between compartments, there must be a means convenient to the 
crew for closing the flow of air through the partitions when necessary.